//
// Copyright (c) Microsoft. All rights reserved.
// Licensed under the MIT license.
//
// Microsoft Bot Framework: http://botframework.com
//
// Bot Framework Emulator Github:
// https://github.com/Microsoft/BotFramwork-Emulator
//
// Copyright (c) Microsoft Corporation
// All rights reserved.
//
// MIT License:
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED ""AS IS"", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//

import * as Restify from 'restify';

const { bodyReader, jsonBodyParser: restifyJsonBodyParser } = Restify.plugins;

export function createJsonBodyParserMiddleware(options?: any): Restify.RequestHandler[] {
  options = options || { mapParams: false };
  options.bodyReader = true;

  const read = bodyReader(options);
  const parseJson = restifyJsonBodyParser(options);

  function parseBody(req: any, res: any, next: any) {
    if (req.method === 'HEAD') {
      next();
      return;
    }

    if (req.method === 'GET' && !options.requestBodyOnGet) {
      next();
      return;
    }

    if (req.contentLength() === 0 && !req.isChunked()) {
      next();
      return;
    }

    let parser;

    switch (req.contentType().toLowerCase()) {
      case 'application/json':
        parser = parseJson[0];
        break;

      default:
        break;
    }

    if (parser) {
      parser(req, res, next);
    } else {
      next();
    }
  }

  return [read, parseBody];
}
